hi, a general level question:
I made a diy brushed serial dc motor.
I used 1mm diameter wire (15m) for armature (3 coills) and cordless drill battery 20v. It is working.
Starting current is by my theorecal calculation is very big, I even was not sure that battery do not interpret the start as short circuit (used stupidly ntc thermistor) in vain.
What kind of inrush current common drill battery can hadle without short circuit reaction?
Now I am wondring how usual cordless drill motors can even to sart and work and handle high current during work even 30 amps, because high torque and efficiency can need even 20-30 amps.
But armature wires are very thin ( perhaps 0.7mm diameter). How these wires can handle 30 amps? What is wire lenght roughly? Can fan be this efficient!?
I am hoppyist and very curious about the secret behind (1) high inrush current and (2) high efficiency, torque and thin wire secret. By my understanding many cordless drill (at least old) not use control electronics PWM or battery bms.
I am ignorant hoppyist and would appreciate answer a lot!
thanks a lot in advance!
I made a diy brushed serial dc motor.
I used 1mm diameter wire (15m) for armature (3 coills) and cordless drill battery 20v. It is working.
Starting current is by my theorecal calculation is very big, I even was not sure that battery do not interpret the start as short circuit (used stupidly ntc thermistor) in vain.
What kind of inrush current common drill battery can hadle without short circuit reaction?
Now I am wondring how usual cordless drill motors can even to sart and work and handle high current during work even 30 amps, because high torque and efficiency can need even 20-30 amps.
But armature wires are very thin ( perhaps 0.7mm diameter). How these wires can handle 30 amps? What is wire lenght roughly? Can fan be this efficient!?
I am hoppyist and very curious about the secret behind (1) high inrush current and (2) high efficiency, torque and thin wire secret. By my understanding many cordless drill (at least old) not use control electronics PWM or battery bms.
I am ignorant hoppyist and would appreciate answer a lot!
thanks a lot in advance!